High-Strength Aluminum Alloy Extrusion Billet

A high-strength aluminum alloy extrusion billet is a semi-finished industrial material supplied as cylindrical or rectangular logs. It serves as the raw feedstock for hot extrusion presses to manufacture complex structural profiles, tubes, and custom shapes. In B2B supply chains, it is a critical upstream material for fabricators in construction, automotive, and aerospace sectors. Its consistent metallurgical properties ensure dimensional accuracy and mechanical performance in final fabricated components. The billet is typically made from aluminum alloys such as 6061 or 7075, which are known for their high strength-to-weight ratio and corrosion resistance. The material is supplied in various diameters (80–300 mm) and lengths (500–1500 mm) to accommodate different extrusion press capacities. The alloy temper is typically T6, which provides a good balance of strength and ductility. Mechanical properties include a tensile strength of 310–350 MPa, yield strength of 280–320 MPa, elongation of 10–15%, and hardness of 95–110 HB. Density ranges from 2.70 to 2.80 g/cm³. Surface quality is controlled with a maximum defect depth of 0.2 mm, and straightness is within 1.5 mm/m. Cut tolerance is ±2 mm, and weight per billet ranges from 15 to 300 kg depending on size. These specifications are referenced to GB/T 3191 for most parameters and GB/T 231.1 for hardness. It is essential for buyers to verify that the actual product meets the required specifications for their specific application, as values may vary with alloy and manufacturing process. Always confirm with the supplier or manufacturer that the billet conforms to the relevant standards and is suitable for the intended extrusion process.

The billet is heated to a plastic state, typically in a furnace, to a temperature that allows deformation without melting. It is then placed in an extrusion press, where a ram applies high pressure to force the heated billet through a die. The die has an opening with the desired cross-sectional shape. As the billet is pushed through, it deforms plastically and emerges as a continuous profile with the same cross-section as the die opening. The extruded profile is then cooled and cut to length. The process requires precise control of temperature, pressure, and speed to ensure uniform material flow and avoid defects such as cracking or surface imperfections. The choice of alloy and temper affects the extrusion parameters and the final mechanical properties of the product.